-geometry flag for XWin?

[Robert Mecklenburg]

I start XWin with "-screen 830 1124" (roughly half my screen width) so
I have room on my desktop for windows apps.  This causes the X root
window to be placed at +0+0.  Is there a way to specify a different
location for the root window?  I'd prefer something like +20+0 so it
doesn't obscure important desktop icons.  (Of course, I've read the
man page and found nothing relevant.  Perhaps I missed it?)

Thanks,
-- 
Robert